Definition of treeline noun from the Oxford Advanced Learner's Dictionary

 

treeline

 noun
noun
BrE BrE//ˈtriːlaɪn//
 
; NAmE NAmE//ˈtriːlaɪn//
 
[singular] Mountains and valleys
 
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a level of land, for example on a mountain, above which trees will not grow There’s still some snow above the treeline. See related entries: Mountains and valleys
See the Oxford Advanced American Dictionary entry: treeline